Braking mechanism for talking-machine motors



L. H. MULLIKIN.

BRAKING MECHANISM FOR TALKING MACHINE MOTORS.

APPucATioN FILED MAR. 26. 1920.

1 95,725. Patented Nov. 1, 1921.

PATENT orFicE.

LEVIN H. MULIiIKIN, or EASTON, MARYLAND.

BRAKING MECHANISM FOR TALKING-MACHINE Morons.

Specification of Letters Patent.

Patented Nov. 1, 1921,.

Application filed March 26, 1320. Serial No. 369,140.

To all whom, it may concern Be it known that I, LEVIN H. MULLIKIN, acitizen-of the United States, residing at Easton, in the countyfofTalbot and State of Maryland, have invented certain new and usefulImprovements in Braking Mechanism for Talking-Machine Motors, of whichthe following is aspecification.

My invention relates to speed regulating mechanism for spring motorssuch as are used in talking machines.

The object of the invention is to regulate the speed of the motor bymeans of a nonrotatable element movable back and forth with the speedresponsive means and a stop to limit the effective movement of saidnonrotatable element to cause the speed-responsive means to exert apulling action on said non-rotatable element and so effect a braking orretarding action on the motor shaft. In the construction shown, thespeed-responsive element is a centrifugal governor and the outwardmovement of the weights thereof is limited by the predetermined positionof the stop and the pull of the governor sleeve upon the non-rotatablemember to which it is swiveled or in which it freely turns. The greaterthe tendency of the weights to fly outwardly due to the speed of themotor, the greater the pull upon the nonrotatable element, and hence abraking or retarding action upon the motor shaft fol lows. Thisconstruction effectively does away with the noise and uneven actiongenerally present where a brake pad is employed in opposition to and toone side of the center of a disk rotating with the governor sleeve.

This object I accomplish by the construction shown on the accompanyingdrawing in which Figure 1 is a front elevation, and

Fig. 2 is a section on line 2-2, Fig. 1.

The vertical shaft 1, which carries the usual horizontal table, notshown, is provided at its lower end with a worm 2 meshing, as usual,with a worm wheel 3 driven from a motor, not shown. The table shaft 1 isprovided with a worm wheel 41 meshing, as usual, with a Worm 5 on theinner end of the governor shaft 6 mounted in the frame 7. Upon thegovernor or worm shaft 6 is mounted the governor sleeve 8 connected atits inner end to the inner endsof the governor springs 9 provided withweights or balls 10; the outer ends of the springs 9 being socured to acollar 11, fixedly secured to the shaft 6. WVhen the balls or weights 10are thrown out by centrifugal action. the governor sleeve 8.will bemoved to the right and with it a slide 12 mounted in a slideway 13secured to or forming part of the frame The connection between the slide12 and sleeve 8 is formed by means of a lateral extension 14 extending.at right angles from the slide 12, and provided at its inner end with anaperture 15 through which extends a headed collar 16 secured to theinner end of the governor sleeve. Ball bearings 16 are placed betweenthe adjacent faces of the collar 16 and extension 14. This forms aswiveled connection and permits the governor sleeve to turn freelywithout rotating the slide and causes the slide to move back and forthwith the sleeve under action of its weights and balls. The governorsleeve is thus, in effect, provided with an annular groove 17 receivingthe apertured end of the slide.

In moving to the right as the balls or weights fly out the laterallyextending end 14 of the slide 12 will be brought up against a pad orstop 19 carried by a bell crank lever 20 pivoted at 21 to the frame andhaving a set-screw 22 at its outer end engaged by the overlying lever 22pivoted at its inner end to the frame and engaged at its opposite end byan adjusting screw 28. By means of these screws 22, 23 the pad 19 may beset at the exact position it is to occupy just as the pads in priorconstructions were set with respect to the rotating brake disks withwhich they cooperated. The slide 12 is nicely fitted in the slideway 13so that no rattling is possible, and, since the braking is effectedthrough this slide, it will be termed the braking member or slide. Thereis no rotary wearing movement of the braking member upon the pad so thatit will not wear down and the parts require constant adjust ment.Furthermore, the pad and braking member in my construction will bear aconstant relation to each other when adjusted, and, even though the padshould get hard or be made of material harder than the felt of whichsuch pads are commonly made, there will be no squeaky noises such as aremade by friction. The effective braking action is where the collar 16pulls upon the lateral extension 14 of the braking member or slide 12,even though a so-called anti-friction or ball hearing be employed atthis point, for the greater the tendency of the weights to fiyoutwardly, the greater the pull upon the anti-frictionmember with itsconsequent clamping or braking action.

I find that motors equipped with my im proved mechanism are entirelynoiseless and they run better, due to the absence of frietion producedby the rotary disk upon a fixed pad. In talking machines absolutenoiselessness of the motor and its parts is, of course, of the veryhighest importance.

Any form of pad or stop and means for adjusting it may be employed inlieu of that shown, as that forms no part of my invention.

I claim:

1. The combination with the governor shaft and a centrifugal governorthereon provided at one end with a loosecollar, of a sliding brakemember having a laterally extending arm. swiveled at its free end to thesaid loose collar, a guide-way for the slide,

and a stop in the path of the said slide to limit its movement.

2. The combination with the governor shaft provided with "a centrifugalgovernor having a flanged collar at one end loose upon the shaft, asliding braking member provided with a lateral arm having an aperture inwhich said flanged collar freely turns, a guide-way for the slidingbraking member and an adjustable. stop in the path of the brakingmember;

In testimony whereof I affix my signature.

LEVIN H. MULLIKIN.

